Cocoblo is widely hailed as one of the most beautiful woods on earth. It one of the many species of rosewood (Dalbergia) from Central America and is marked with rich orange, reds, and yellows with traces of black. The natural oil finish I used for this pen will allow the natural oils in your hands to continue to bring out the character of the cocobolo. With time, it will patina and reflect the time you spent using it. The fitting are made of bronze, and have a hand rubbed patina. As you write, it will begin to burnish and "break in" adding to its richness. It will come fitted with a piston converter so you can use your favorite bottled ink. I will also include an international ink cartridge in case you prefer this filling method. Additional cartridges may be purchased at most office supply outlets and stationary shops. Should you choose the rollerball, the international sized insert included is the most common size on the market and many brands are available at most office supply retailers.